Antijimmy tubular lock



Jan. 11, 1949. GN KGHT 2,45%,751

ANTIJIMMY TUBULAR LOCK Filed Oct. 4, 1945 Patented Jan. 11, 1949 AN TIJ IMMY TUBULAR LOCK Henry G. Voight, Hamden, Conn, assignor to Sargent & Company, New Haven, Conn, a corporation of Connecticut Application October 4, 1943, Serial No. 504,817

- 2 Claims.

This invention relates to door locks, and more particularly to a door lock of the so-called night latch type, which is provided with a rotating bolt designed to cooperate with a keeper on the door jamb, which keeper is in the form of a stud or post.

It is well known that doors are very often forced by the insertion of a tool between the door and door jamb, and by means of this tool forcing the door away from the jamb to a sufficient extent to disengage the bolt from the keeper, and in some instances means have been provided to prevent such an operation.

The lock of the present application is designed to be jimmy-proo in this respect, as interengaging means are provided on the keeper and bolt to prevent the forcing apart of these two elements, and therefore prevent their disengagement.

As illustrated, the lock is shown as a tubular lock or one in which the parts are contained in a substantially tubular case which may be inserted in. a circular opening or bore drilled through the edge of the door. Moreover, the bolt is mounted in the lock for rotation about the same axis as that of the tubular case, that is, about an axis perpendicular to the plane of the edge of the door, the bolt projecting from the edge of the door for engagement with the keeper. Also means are provided for positively dogging the bolt against rotation when it is in engagement with the keeper, so that the door may not be opened without a manual operation to withdraw the dog from operative position. That is to say, the door handle or knob or key-operated means must be manipulated to open the door, as distinguished from some locks of a similar character wherein the bolt is merely releasably held in position so that the door may be opened by a push or pull thereon.

One object of the present invention is to provide a jimmy-proof door lock having a projecting bolt mounted for rotating movement.

A further object of the invention is to provide a door lock having a bolt designed to rotate on an axis perpendicular to the plane of the edge of the door and means for preventing disengagement of the bolt from the keeper by an instrument inserted between the door and door jamb.

A still further object of the invention is to I which may be 'rotatedfromunlocked., to,locked position by engagement with the keeper when the door is being closed.

To these and other ends the invention consists in the novel features and combinations of parts to be hereinafter described and claimed.

In the accompanying drawing:

Fig. 1 is a sectional View of a lock embodying my improvements, shown mounted upon a door;

Fig. 2 is a face view of the lock case showing the bolt projecting therefrom;

Fig. 3 is a sectional view on line 3-3 of Fig. 2;

Fig. 4 is a rear elevational view of the bolt member;

Figs. 5 and 6 are diagrammatic views showing the operation of the bolt as it approaches and engages the keeper; and

Fig. '7 is a sectional view on line 11 of Fig. 1 on a reduced scale.

To illustrate a preferred embodiment of my invention I have shown. a door at H), cooperating with a stop II on the door jamb I2. Within a circular opening Is in the door is mounted a lock case M of generally tubular shape, the case being provided with a front plate I 5 and a finish ing plate is secured thereto,

The bolt is rotatably mounted adjacent the front end of the case, and comprises a body portion I! and a projecting head l8 connected to the body by a neck l9 extending through the plates I5 and Hi, this neck being provided with a reduced portion at having shoulders at each side thereof so that the bolt will be held against longitudinal or axial movement relatively to the case. It may be noted that the body portion IT fits snugly within the case and is of generally cylindrical shape, so that the bolt will be rotatably carried by the case.

As shown in Figs. 2, 5 and 6, the bolt head is of circular shape and is eccentrically mounted with respect tothe neck i9 and the body H so that the larger area of the bolt stands above its axis. The bolt is provided with a slot 2i opening through the periphery thereof, this slot being designed to receive and cooperate with a keeper 22 in the form of a stud secured to the door jamb and projecting toward the face of the door. As shown, this stud is somewhat longer than the thickness of the bolt l8, and thus projects through the slot to the far side of the bolt head and is provided with a head 23 on its projecting end, the diameter of the head being greater than the width of the slot 2!.

As shown in the diagrammatic views, Figs. 5 and 6, the parts are mounted in such relation that, as the door is closed the keeper will enter the mouth of the slot and strike against the longer or upper wall thereof, thus rotating the bolt through a small angle as the door is further closed. Fig. 5, for example, shows the position of the parts as the door approaches closed position and the keeper 22 engages against the longer wall of the slot 2|. It may be noted that this slot is non-radiallydisposed'with respect to the center of the bolt head. Asthe door is further closed the bolt head [8 is rotated to the position shown in Fig. 6, in which the keeper 22 is embraced by the walls of the slot 2|. the door will now be held in closed position when the bolt is prevented from rotating from the position shown in Fig. 6, but that if" the bolt isleleased a pull upon the door will serve to open the same, the bolt being reversely rotated during the opening movement to the position shown in Fig. 5, where it will again stand ready to receive the keeper when the door is closed.

Meansare providedto dog; orhold the bolt in the position shown in Fig. 6, and also to releasably hold it in the position shown in Fig; 5. In the latter position, however, the. bolt will be free to be rotated by engagement. with the keeper, and when rotatedtothe position in Fig. 6, will be automatically: dogged.

For thispurposeayoke 2'5 isslidably mounted inthe case M, the yoke being provided with guide lugs 26 slidably received in slots 21 at the rear :s

end. of the case. Secured at the front of the yoke 25-is a forwardly projecting dog 28 designed to be received in a slot 29 extending across the rear face of the bolt. The yoke is urged forwardly by a compression spring 30 which tends to maintain I it in its forward position in engagement with the body ll. of the'bolt'.

The dogging member 20 extends across the rear face of the bolt body, its length being substantially equal to the diameter-oi this body, and the width of the dogging member is such that it fits snugly within theslot 29-; The body of the bolt is also provided with a secondslot 3! upon its rear face, which slot intersects the slot 29 at a slight angle thereto, which angle corresponds to that between the positions of the bolt head shown in Figs. 5 and 6; The wall of'the slot 3!, which is adjacent the slot 29, is beveled, as-shown at and the dog 28 is provided with a complementally beveled surface 33 so that when the dog stands in the slot 31 the bolt may be rotated if a sufficient torque is exerted thereon, and the dog 28'cammed rearwardly by the cooperation of the cam surfaces 32 and 33 against the action of the spring 30. It will, however, be understood that when the dog 28' lies in the slot 29 the bolt will be positively held against rotation.

Means are provided at the inside and outside of the door for withdrawing the dog from the slot 29 so that the door may be opened. For this purpose a hub 35 is rotatably mountedin the lock case, this hub carrying a rollback 36 acting against the lugs 28 to withdraw the dog-carrying yoke 25. The hub 35 is provided with a noncircular opening 3? through which extends a spindle 38 having a knob 33 secured theretoat the inside of the door, the knob being mounted upon an inside escutcheon Ml.

An escutcheon 4| is secured at the outside of the door by means of screws 42 passed through the inner escutcheon and entering lugs l3 pro vided on the outer escutcheon. A look such as a pin tumbler lock M is mounted in the escutcheon 4|, the lock having: a key. barrel #25. having connection-with theistem; 38wsoxthatxthe= door may be It will be obvious that.

opened from the outside by means of a key. In order that the inside knob may be operable without turning the key barrel, a lost-motion connection is provided between the key barrel and the stem 38, such, for example, as that shown in Patent No. 2,124,897, granted to John H. Shaw July 26, 1938.

Thelockytis providediwith' a face member il of greater size-than the openingin:the-escutcheon 4| through which the body of the lock is inserted, and the lock may be held in place after being inserted through the face of the escutcheon by screws 48 passing through a plate 49 within the escutcheon and being threaded into wings 58 secured to thebodyyof the lock.

The-operation of-the lock is as follows: When the door is in open position it will be understood that the dogging member 28 stands in the slot 3! and-that the bolt head l8 stands in the position shown in Fig. 5. As the. door is swung to closed position-\thetbody of: the keeper 2 2istrikes against thellonger wallloifthe slot 2|. and serves to rotate the boltto the positionshown in;Fig; 6.when the door is-fully. closed. Thiszrotation'of the boltby:

engagement with. the; keeper member will: serve to cam the dog 28 out of the slot 3| against the action of thespring 3D by=reasonx of thecooperation of'the beveled surfaces3Z-iand 3-3. When the bolt has reached. the position, shoWniinFig. 6, the doge28.will be-projectedforwardlyuby the spring 36', and will enter the slot29, thus dogging the bolt against rotation. and holding the door firmly in closed position.

The operation of. opening; the: door may be eiiected eitherby the knob fromtheinside or by a key from'the outside, eitherofwhich will serve to rotate the spindle 3S; and; thus through the rollback 36 move: the yoke 25.; rearwardly; and withdraw the dog 28 from the slot 29. At this time the bolt will :befreefor rotation and the door may be freely openedby a pull: or push th re nhis' p i movement of the door will serve to effect areverserotation of the bolt from the position shown in Fig. 6-.to that shown in Fig. 5, so that when thezkey. or knob is released the dog 28: will bewprojected into the slot 3.! by the action of the spring 30 in order to releasably hold the bolt in the proper position to receivethe keeper when the door.- isagain closed.

It. will also be noted that the keeper 22, as shown in Fig. 1, projects through the slot in the bolt head and extends to the far side of the latter. The head 23 on the keeper, being slightly larger than the width of the slot 21-, willprevent the separation or disengagement of these parts by a tool inserted between the door and the jamb. The lock is, therefore, jimmy-proof inthat the door cannot be pried away. from the lamb to a suiii'cient extent to disengage the bolthead from the keeper.

While I have shown and' described a preferred embodiment of" my invention, it. will be understood that it: is: not to .be-limited to all of the details shown, but iscapableof modification and variation within the spiritlof the. invention and within the scope, oftheclaims;

What I claim is:

i. A door lock comprising a case of generally tubular shape, a bolt rotatably mounted in the case and projecting therefrom, said bolt having a body portion snugly fitting said case, a head portion lying without. the case, and'a neck portion connecting said" head and body and passing through an openinginthefront: of the case, said neck portion being" or" reduced size: with respect to said head and body and being provided with means engaging the front face of the case to prevent movement of the bolt in an axial direction.

2. A door lock comprising a case of generally tubular shape, a bolt rotatably mounted in the case and projecting therefrom, said bolt having a body portion snugly fitting said case, ahead portion lying without the case, a neck portion connecting said head and body and passing through an opening in the front of the case, said neck portion being of reduced size with respect to said head and body and being provided with means engaging the front face of the case to prevent movement of the bolt in an axial direction, a dogging member engaging the rear face of the bolt body to restrain the bolt against movement and means including a rotatable knob member to withdraw said dogging member from engagement with the bolt.

HENRY G. VOIGHT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

